She just winks, so I stay.

Sally frowned for a second, looking worried. Then she winked at me. She mouthed silently "Hi Steve," and turned her face away. I felt my face flush hot, but I couldn't tear myself away as Sally quivered under her brother's tongue.

She wiggled her butt right at me. "Okay Sal," she said to her younger brother.

Sal pulled his head back and straightened it up. He took a deep breath of air. His lips glistened with his sister's pussy juice. Then he palmed her tight buttocks, spread them, and leaned forward to tongue her ass.

Sally bucked. "Oh!" she said. Maybe Sal had been too abrupt to start. But she settled down and let him continue. I heard little wet sounds as he kissed and licked her anus, and her sighs and moans increased. I could see the pleasure wasn't all one-way, as Sal's ball sack tightened around his testicles, lifting and defining them into two big pink beans against the root of his shaft.

Sally's shoulders tilted as she snaked a hand back toward her pussy lips. Between her fingers and her brother's tongue, Sally soon achieved orbit. Her hips bucked and rolled, and her red-haired head tossed up and down.

Sal held on as best he could and I saw his cock drip a fat white drop on the ground. He was on the edge. Sal whined in lustful frustration and put his head up. "Sis, I gotta..."

"Up my crack," Sally gasped out.

Sal kneeled up and tucked his cock between his sister's buttocks, pumping and sliding it up and down the wet crack where his tongue had just been. Sally pushed back against him, moving with the ebbing tide of her own orgasm. Sal ground his cock against his big sister's pussy and ass, seeking release. "Uhhhh-Ah!" he groaned as his climax peaked. His shoulders and hips bucked, and he spurted hot blobs of come into Sally's butt crack and up her back.

After a couple minutes breathing space, they eased back from one another and mopped their sweaty, slippery bodies with their shirts. They sat down next to each other, leaning against the shady wall, letting the sweat evaporate.

"I hope we run into Steve and Lisa at Tom and Jeri's party," Sally said, pretending for Sal that she didn't know I was there. "I bet I can get Steve going, and then you'll have a good shot at Lisa."

"Naw, Sally," Sal said. "Lisa's shy, and she'll be hanging off her husband while Jeri bounces her tits at him. We gotta get her in the mood to have fun, and then he'll go along."

"Yeah," Sally said. "Maybe we can teach them some new dances or something."

"Sal! Sally!" a woman called from the back door.

She was tall and slim like the two young people, wearing a light sundress in the heat, and her face was an older, feminine edition of Sal's cheerful snub-nosed visage. Perhaps Sally's sharper features came from her dad.

"I hear you back there," the woman called. "Time to come in!"

"Coming, mother!" they chorused. They grabbed their clothes and ran to the back door without covering up, balls, cock, and tits jiggling. Sally was first, and ran past her mother into the house. She frowned and looked round as Sally went by.

"Salton Avery!" she said as Sal ran up. "Have you been fucking your sister?"

"No, mom," he said.

She frowned again. "Were you sodomizing her?"

"No, mom," he said. "You said that was only for..."

"You two were up to something," she said. "I can smell pecker juice on both of you. Now what have I been telling you two?" she said. "About discretion, to start with. Come with me, young man." She took his hand and led him inside.

The door closed behind them.

I stood leaning against the gate with a raging hard-on in my running shorts, my mind's eye full of Sal and Sally doing each other, and my thoughts full of apprehension about Sally catching me watching them. Not to mention their designs on Lisa and me at the party.

And then there was that ice cream for Lisa. I really wanted to jack off to clear my head, but maybe Lisa would take pity on my poor cock if I brought her some really good ice cream.